Then there is the theory that the unconscious muscular action of the sitters is the cause of the movement and writing. This has been considered before, and it was pointed out that, even granting for the sake of argument that the board was actually moved by this means, the question still remains: How are we to account for the mentality behind the movement--especially when facts are given unknown to all the members of the circle? (For an example of this see _Proceedings, S.P.R._, vol. ix. pp. 93-8.) The question thus arises: _What_ did the writing? The theory of unconscious muscular action has been considered, and found not to explain all the facts. Many might contend that the board was moved by a principle or force as yet unknown, and think the question settled in that way. Of course this is a mere begging of the question, for all practical purposes, because, if the explanation were known, there would be no mystery and no argument about it. But the mere statement that the board is operated by a force as yet unknown merely restates the problem, without in any way attempting to solve it, and hence leaves us precisely where we were. Certainly this theory will not do! Undoubtedly, the simplest explanation--and the correct one--for the majority of the facts is that the subconscious mind is alone responsible for them. Thoughts, images, reflections, imaginations, tend to externalize or express themselves in this manner,--in motor avenues,--through the movement of the board. The vast majority of ouija board "communications" are to be accounted for in this way. But what of those other (relatively rare) cases in which supernormal information, unknown to the sitter, is obtained? Any theory which is advanced must explain these cases also, as well as the movement of the board, and pure subconscious activity does not. We should still have to account for this knowledge, unknown to the writer; so that we shall have to seek further yet, in order to discover the true cause of the intelligence doing the writing.